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I believe they implemented panels inside the browser window that force the window size to be different reported values.

• Forbo 6y ago
  It's called "letterboxing", and rounds the window size to the nearest 200x100 px when maximized, I think. So while it does make you slightly less unique than just maximizing normally would, that anonymity set is still potentially smaller than the set that can fit everyone, namely the 1000x1000 default. There are methods of detecting screen resolution using CSS that don't require JavaScript, so blocking JavaScript doesn't necessarily protect you from this fingerprinting method.
  • Scoundreller 6y ago
    Fascinating to realize that CSS can do that. I guess it does it by “calling” x.png 1024 times and y.png 768 times? Or running some loop to call 1024x.png and 768y.png...
    • bowmessage 6y ago
      No loop necessary, maybe just a set of @media rules with e.g. custom .png resources: https://developer.mozilla.org/en-US/docs/Web/CSS/@media https://developer.mozilla.org/en-US/docs/Web/CSS/@media